Truong has reportedly confessed that he made the explosive by himself and set it off with a remote control device when Khanh was taking his motorbike out of the house.

The explosion caused no casualties, but shattered doors and windows in vicinity.

Police later confiscated 30.4 kilograms of explosives and 475 detonators from Truong's house.

At a press conference last week, the provincial police said that the explosion aimed to "paralyze" police investigations into property disputes between Truong's rock quarrying company, Song Ma, and the Ho Chi Minh City-based Kiet Viet Company.

A report on the Phap Luat (Law) Vietnam website says that in 2003 the two companies cooperated on a project to exploit a rock mining site in Can Lam District, but four years later they became embroiled in a property dispute.

Truong filed complaints against Kiet Viet with Khanh Hoa's economic crimes division (PC15), accusing it of defrauding and depriving him of his properties. But, PC15 concluded then that there was no sign of crime in the case and that it was a civic dispute.

Truong then filed more complaints about the way PC15 handled the case, accusing the agency of shielding people engaged in wrongdoing.

However, once again, Khanh Hoa inspectors concluded that the accusation was "baseless," saying PC15 had done nothing wrong.

In the meantime, Nguyen Dinh Phuoc, chief of the neighborhood where Truong lives in Nha Trang Town, said the man had many times anonymously filed complaints about many people, including local police officers who he accused of being corrupt.

In fact, in 2009, Truong accused two officers of stealing his family's properties, but it was later found that the accusation was false, Phuoc said.

Nguyen Huu Anh, deputy chief of Khanh Hoa's department that deals with civil cases, told the press that his agency has seized a truck that belongs to Truong and confiscate his house over debts owed to the Mekong Housing Bank.

The case is being investigated further

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Man arrested for explosion outside Vietnam cop's home

In other related news, Nguyen Nhu Tuan, police chief in the northern province of Thai Nguyen, told Thanh Nien on the phone that he was still waiting for conclusions from the Ministry of Public Security about the bomb explosion that shook his house on January 7 this year.

The bomb damaged the first floor of Tuan's house, but no one was injured.

The director had then told the press that he suspected the attack was by someone seeking personal revenge.